Trane CGWF SE Installation Operation & Maintenance page 70

Symptom
E The compressor
does not start
because the
minimum
pressure switch
has tripped
G Lack of gas
H Frost in the
liquid line
downstream from
a filter
I The unit works
continuously
without ever
stopping
L The unit works
regularly but with
an insufficient
capacity
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Who can take
corrective action U
Cooling Heating = User
S = specialised
personnel
x x
x x
x
x
x
x x
x x
x x
x x
x x
x x
x x
x x
x x
x x
x x
x x
Probable cause
s
Pressure switch out of order
s
Unit completely void of refrigerant
u
Water circulation pump blocked
Water circulation pump blocked and
s
defective
Presence of frost on the evaporator
s
coil
s
Refrigerant filter clogged
Expansion device that is not working
s
properly
Presence of moisture in the
s
refrigerant circuit
s
Loss in the refrigerant circuit
s
The filter is clogged
s
Lack of refrigerant gas
Incorrect tuning of the operating
u
thermostat
s
Excessive thermal load
Compressor does not give the
s
thermal output
s
The liquid filter is clogged
s
Low refrigerant charge
s
4-way reversing valve defective
Possible remedy
Check and replace.
See point G.
Unlock the pump
Check the pump and replace if necessary
See point N.
Check and replace.
Check and replace if necessary.
Replace the filter, dry and recharge
Check the cooling circuit using a leak
detector after pressurising the circuit to
approximately 4 bars.
Repair, evacuate and refill.
Replace the filter
See item G.
Check and set.
Reduce the thermal load
Check, change or revise
Replace.
See point G.
Check the power supply and the coil of the
valve and replace the valve